serial: sh-sci: fix common SCIFB regmap definition

About FIFO count, there are two variants of SCIFs which show
a) TX count in upper, RX count in lower byte of FDR register
b) TX count in TFDR register, RX count in RFDR register

Common SCIFB regmap in current source code is defined as "a".
At least 7372 and 73a0 HW manual say their SICFB are "b".

This patch alters the definition to "b", considering the current
one has come from a mistake. The reason is as follows.

The flag SCIFB sh-sci driver means it has 256 byte FIFO.
The count is from 0(empty) to 256(full), that makes 9-bit.
Because FDR is 16-bit register, it can not hold two 9-bits.
That's why, SCIFB can not be "a".

Signed-off-by: Takashi Yoshii <takashi.yoshii.zj@renesas.com>
Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi.px@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index c2d359cba55d47db40708b29a1582cbd1235961a..107801b1279a18125f4fd99ba60889296597152a 100644 (file)
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -196,9 +196,9 @@ static struct plat_sci_reg sci_regmap[SCIx_NR_REGTYPES][SCIx_NR_REGS] = {
                [SCxSR]         = { 0x14, 16 },
                [SCxRDR]        = { 0x60,  8 },
                [SCFCR]         = { 0x18, 16 },
-               [SCFDR]         = { 0x1c, 16 },
-               [SCTFDR]        = sci_reg_invalid,
-               [SCRFDR]        = sci_reg_invalid,
+               [SCFDR]         = sci_reg_invalid,
+               [SCTFDR]        = { 0x38, 16 },
+               [SCRFDR]        = { 0x3c, 16 },
                [SCSPTR]        = sci_reg_invalid,
                [SCLSR]         = sci_reg_invalid,
        },